Pointer to the derived class and base class

 

For Example: Write a program to declare a pointer to the derived class and access the member variable of base and derived class.

#include<iostream.h>

#include<conio.h>

class A

{

public:

int b;

void display()

{

cout<<"Value B is="<<b<<endl;

}

};

 

class B : public A

{

public:

int d;

void display()

{

cout<<"Value of B is ="<<b<<endl<<"Value of D is ="<<d<<endl;

}

};

 

void main()

{

B *cp; // here cp is pointer object derived class

B b;   // here b is object of B class

cp=&b;  //initialized simple object to pointer object

cp->b=200; //Assign value to pointer object

cout<<"CP points to the derived object"<<endl;

cp->display(); //member function calling with the help of pointer object

getch();

}

Output:



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